A process for the preparation of known herbicidally active phenyl carbamates
申请人:BEROL NOBEL (SUISSE) S.A.
公开号:EP0142670A2
公开(公告)日:1985-05-29
Herbicidally active substituted phenyl carbamates
in which R' represents a C1-C6 alkyl group, a C3-C8 cycloalkyl group or an aryl group, which aryl group may be substituted by a halogen atom and/or a C1-C6 alkyl group and/or a trifluoromethyl group, and R2 represents a C1-C6 alkyl, C2-C6 alkenyl or C2-C6 alkynyl group that may be substituted by a terminal halogen atom, are prepared by reacting N-hydroxyphenyl carbamates II
with either isocyanates R'-N=C=O or amino acid chlorides R'-NH-COCI in an aqueous medium thus avoiding the use of organic solvents. The end product I may be extracted from the aqueous slurry into a water-immiscible solvent.
The N-hydroxyphenyl carbamates II can be prepared by reacting 3-aminophenol with chloroformates in an aqueous medium, and the resulting product may be reacted in situ, without isolation, with isocyanates, in the same reaction vessel.
Stabilized herbicidal compositions containing compounds I may be prepared by suspending the compounds I in a liquid phase comprising one or more oily components and one or more surfactants.
具有除草活性的取代苯基氨基甲酸酯类化合物
其中 R'代表 C1-C6 烷基、C3-C8 环烷基或芳基,该芳基可被卤素原子和/或 C1-C6 烷基和/或三氟甲基取代,R2 代表可被末端卤素原子取代的 C1-C6 烷基、C2-C6 烯基或 C2-C6 烷炔基,通过使 N-羟基苯基氨基甲酸酯 II 与异氰酸酯 R'-N=C=O 或氨基酸氯化物 R'-NH-COCI 反应制备。
与异氰酸酯 R'-N=C=O 或氨基酸氯化物 R'-NH-COCI 在水介质中反应,从而避免使用有机溶剂。最终产品 I 可从水性浆液中提取到水不溶性溶剂中。
N-hydroxyphenyl carbamates II 可通过在水介质中使 3-aminophenol 与氯甲酸酯反应来制备,所得产物可在同一反应容器中与异氰酸酯原位反应,无需分离。
含有化合物 I 的稳定除草组合物可以通过将化合物 I 悬浮在包含一种或多种油性成分和一种或多种表面活性剂的液相中来制备。
Stabilized liquid herbicidal composition and process for its preparation
申请人:Hoechst Schering AgrEvo GmbH
公开号:EP0242888A2
公开(公告)日:1987-10-28
A stabilized liquid herbicidal composition comprising, as active ingredient, a herbicidally effective amount of phenmedipham and/or desmedipham, in which the active ingredient in a finely ground state is dispersed in an acidic liquid phase which comprises at least one oily component in an amount of 5-75% by weight, and at least one surfactant in an amount of 5-60% by weight, and optionally water. The stabilized liquid herbicidal composition will, when it is diluted with water before the final use, form an oil-in-water emulsion or a microemulsion. The herbicidal composition may be prepared directly from moist phenmedipham and/or desmedipham. The compositions are especially preferred for use in beet fields.